Electric lamp for cinematographic apparatus



April 19 1927,

J. MARETTE ELECTRIC LAMP FOR CINEMATOGRAPHIC APPARATUS Filed Aug. 8, 1922 facq ues Mdrcljte lNVENTOR;

w Attorney.

Patented Apr. 19, 1927.

UNITED STATES PATENT OFFICE...

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nnncrarcinmr non cmEMA'roeaArnIc arrnan'rua Application filedAugust 8, 1922, Ser1a1 No. 580,507, and in France December 5, 1921;

This invention has for its object an im-] movement in electric lamps for cinematographic apparatus and other projection aplamp in its socket.

paratus, particularly for those which are 5 intended -to be manipulated by a public of amateurs, this improvement permitting to obtain an exact position in height and in orientation of thefilament of the lamp with reference to the opticalzsyst'em of the apparatus', lenses and mirror or analo ous system, with a view of working in the est con ditions of luminous efliciency without having to carry out a precise'adjustme'nt, for example by projecting the filament upon the projection cult especially ior the public which is generally inexperienced.

Accordingto-the invention, the fittin of the lamp is provided with a ring or ike part adapted to rest upon the lamp socket and placed in sucha position as toensure the correct position of the lamp filament as to height, said.

a lug, tongue orenter a corresponding recess'in the sgcket and occupying a determined, position for ensuring the proper angular position of the filament. -i

Inasmuch as the socket which will receive the lamp inthe proiectionapparatus has a fixed position suitab y determined with reference to the optical elements of the apparatus, and since each ring is secured at the factory upon the fitting of each lampex actl m'the .desired posltion and thelug' or pro ection is located on the ring in the exact position desired,.with respect to the filament of said lamp, it will-be understood that it is'thus possible to sell to the public lamps which will be interchangeable and it will he suflicient to place into the'lamp socket.

of the apparatus any lamp constructed in accordancewith the invention and the filamentof said lamp will immediately occupy the position requ1red without' any previousfilament being immediately. in alignment w1th the optical axis, at, the;

adjustment, said desired height and in the proper positionas concerns its lateral angular p o s1t1on f d In the accompanying drawing g enby way of example: v A

Fig. 1 is adiagrammatical view ota screen, which operation is difli-' g beingprovided with like memberadapted to jection apparatus with the improved lamp. according to the invention.

Fig. 2 is aview on a large scale of the 55.

Fig. 3 is the section of the socket accord- According to the form of construction represented, one secures to the base or fittin H60,

4 of the lamp a split ring 1 providedwit a tenon,-lug or projection 2. This ring can be secured to the base 4-by means of a screw 6 or a soldered place or by any other means. The baseflis engaged. in the ordin'ar way in the socket 3*of the lamp holder w ich 1s. provided with a vertical slot" into which the tenon 2 enters; The positiomto be occupied by the splitring provided'with its tenon is determined by a I previous adjustment (0 made at the factory. It is thusseen that mjorder to put the lamp in placein the socket, it is required to turn it so that the tenon shall engage in the slot, which will. have the effect of turning the filament, about 76 m the proper direction. :By' then pushing the'la base into itssocket, thelower edge of the r ng will make contact with the upper edge of the socket, whereb the adjustment of the filament as .to heig t will be niiade. so On theother hand, the socket 3 occu ies the desired position'in its carrier so t at its filament is in alignment with the optical system. 1

Any unskilled person is thus-certain to as properly place the filament of the lamp with reference, for instance, tothe system of lenses and mirror of a projectionlantern.

- The present invention of course not limited to the dispositions indicated by way to r can be-mad'e of a difierent material. The

method of attaching the ring to the lamp base. may beabsolutely of any kind. The form of thegtenon ismot limited to the one shown: infthe drawi'n the device can be applied-toall t peso electric'1an1ps.

Havingnow escri'bed my inventiom what I claim as new ,apd desire to se'cure by Let-' t sgfiatentis:

' lightiiig device for pro ection apparatus comprising an ordinary glow-lamp, a ring the lower part of said cap and adapted to secured to thecap of said 1am and adapted engage into a recess provided in said, lampto rest with its lower edge on t e upper edge socket for ensuring automatically the exact 10 of the lamp-socket for ensuring automatiangular position of said filament.

5 cally the exact position in height of the lamp In testimony whereof I have signed my filamen and a lug secured on said ring exname to this specification. tending longitudinally on said cap towards JACQUES MARETTE. 

